is this power supply possible

[dBel84]

I was wondering if the circuit below would work - i.e. enable a voltage mutiplier to increase the B+ but still allow for dual rails for something like an OP551 or intersil buffer. I am not sure how this would behave if the B+ ground is tied to the "virtual ground" created by the voltage divider. I realise that this cannot be tied to the mains ground and this may not be the safest practice but B+ would "only" be around 80V. My intention was to isolate the circuit from the chassis and tie that to IEC ground. The transformer has single secondaries and no center tap.

thanks ..dB

 

[Budgie]

I can't comment on the voltage doubler part of the schematic, but if the question is "can the voltage doubler and the low voltage bipolar work from the same transformer", the answer is yes they can.

Look at this-
HeadWize Projects - A Simple Tube/Opamp Hybrid Amplifier by Alex Cavalli et al.

 

[dBel84]

I have actually built a power supply similar to this and it does work, BUT it uses a center tapped transformer. My question here is can the circuit work without a center tap and still behave - the LV portion would be fine as it creates a virtual ground reference - the VREGs would push against one another but should be OK. My concern is connecting the HV ( doubler ) portion to the virtual ground, I suspect this may be induce some imbalance but don't have the know how to figure the behaviour out.

ps- this is actually a bastardization of runeight's scheme

..dB

 

[Budgie]

Damn, your right! I totally missed that aspect. Looks like no ground path for the HV doubler.

 

[Budgie]

Try here-
Voltage Multipliers

 

[kipman725]

with a quick glance it should work aslong as the load is very low on the multi. They have terible sag and ripple with increasing loads.

 

[dBel84]

thanks, load will be small. I think I will bread board it first before making pcbs and make sure nothing unexpected happens.

I want to build a small amp along the lines of a nano soha/ LD nano tube but with a "decent" B+ ..dB